Musicians John Mayer, left, and Keith Urban perform together at Eric Clapton's Crossroads Guitar Festival 2013 at Madison Square Garden on Friday April 12, 2013 in New York. (Photo by Evan Agostini/Invision for Hard Rock International/AP Images) less

Musicians John Mayer, left, and Keith Urban perform together at Eric Clapton's Crossroads Guitar Festival 2013 at Madison Square Garden on Friday April 12, 2013 in New York. (Photo by Evan Agostini/Invision for ... more

Musician John Mayer, left, helps Keith Urban when his guitar strap malfunctions during their performance together at Eric Clapton's Crossroads Guitar Festival 2013 at Madison Square Garden on Friday April 12, 2013 in New York. (Photo by Evan Agostini/Invision for Hard Rock International/AP Images) less

Musician John Mayer, left, helps Keith Urban when his guitar strap malfunctions during their performance together at Eric Clapton's Crossroads Guitar Festival 2013 at Madison Square Garden on Friday April 12, ... more

Musician Eric Clapton, right, joins Warren Haynes and The Allman Brothers Band on stage at Eric Clapton's Crossroads Guitar Festival 2013 at Madison Square Garden on Friday April 12, 2013 in New York. (Photo by Evan Agostini/Invision for Hard Rock International/AP Images) less

Musician Eric Clapton, right, joins Warren Haynes and The Allman Brothers Band on stage at Eric Clapton's Crossroads Guitar Festival 2013 at Madison Square Garden on Friday April 12, 2013 in New York. (Photo by ... more

IMAGE DISTRIBUTED FOR HARD ROCK INTERNATIONAL - From left, musicians James "J.Y." Young, Tommy Shaw, Chuck Panozzo and Ricky Phillips of the band Styx, perform at Eric Clapton's Crossroads Guitar Festival artist party at The Hard Rock Cafe New York on Thursday, April 11, 2013 in New York City, New York. less

IMAGE DISTRIBUTED FOR HARD ROCK INTERNATIONAL - From left, musicians James "J.Y." Young, Tommy Shaw, Chuck Panozzo and Ricky Phillips of the band Styx, perform at Eric Clapton's Crossroads Guitar Festival ... more

Musician Booker T. Jones, left, and band with Steve Kropper, right, on guitar, perform at Eric Clapton's Crossroads Guitar Festival 2013 at Madison Square Garden on Friday April 12, 2013 in New York. (Photo by Evan Agostini/Invision for Hard Rock International/AP Images) less

Musician Booker T. Jones, left, and band with Steve Kropper, right, on guitar, perform at Eric Clapton's Crossroads Guitar Festival 2013 at Madison Square Garden on Friday April 12, 2013 in New York. (Photo by ... more

Musicians John Mayer, left, and Keith Urban perform together at Eric Clapton's Crossroads Guitar Festival 2013 at Madison Square Garden on Friday April 12, 2013 in New York. (Photo by Evan Agostini/Invision for Hard Rock International/AP Images) less

Musicians John Mayer, left, and Keith Urban perform together at Eric Clapton's Crossroads Guitar Festival 2013 at Madison Square Garden on Friday April 12, 2013 in New York. (Photo by Evan Agostini/Invision for ... more

IMAGE DISTRIBUTED FOR HARD ROCK INTERNATIONAL - Musicians Malina Moye, left, and Robert Randolph attend Eric Clapton's Crossroads Guitar Festival artist party at The Hard Rock Cafe New York on Thursday, April 11, 2013 in New York City, New York. less

IMAGE DISTRIBUTED FOR HARD ROCK INTERNATIONAL - Musicians Malina Moye, left, and Robert Randolph attend Eric Clapton's Crossroads Guitar Festival artist party at The Hard Rock Cafe New York on Thursday, April ... more

IMAGE DISTRIBUTED FOR HARD ROCK INTERNATIONAL - Actor and musician Dan Aykroyd poses with Hard Rock's new limited edition Eric Clapton Artist Spotlight T-Shirt at Eric Clapton's Crossroads Guitar Festival artist party at The Hard Rock Cafe New York on Thursday, April 11, 2013 in New York City, New York. less

IMAGE DISTRIBUTED FOR HARD ROCK INTERNATIONAL - Actor and musician Dan Aykroyd attends Eric Clapton's Crossroads Guitar Festival artist party at The Hard Rock Cafe New York on Thursday, April 11, 2013 in New York City, New York. less

IMAGE DISTRIBUTED FOR HARD ROCK INTERNATIONAL - Actor and musician Dan Aykroyd attends Eric Clapton's Crossroads Guitar Festival artist party at The Hard Rock Cafe New York on Thursday, April 11, 2013 in New ... more

IMAGE DISTRIBUTED FOR HARD ROCK INTERNATIONAL - From left, musicians Ricky Phillips, James "J.Y." Young and Tommy Shaw of the band Styx perform at Eric Clapton's Crossroads Guitar Festival artist party at The Hard Rock Cafe New York on Thursday, April 11, 2013 in New York City, New York. less

IMAGE DISTRIBUTED FOR HARD ROCK INTERNATIONAL - From left, musicians Ricky Phillips, James "J.Y." Young and Tommy Shaw of the band Styx perform at Eric Clapton's Crossroads Guitar Festival artist party at The ... more

IMAGE DISTRIBUTED FOR HARD ROCK INTERNATIONAL - Musician Tommy Shaw and the band Styx performs at Eric Clapton's Crossroads Guitar Festival artist party at The Hard Rock Cafe New York on Thursday, April 11, 2013 in New York City, New York. less

IMAGE DISTRIBUTED FOR HARD ROCK INTERNATIONAL - Musician Tommy Shaw and the band Styx performs at Eric Clapton's Crossroads Guitar Festival artist party at The Hard Rock Cafe New York on Thursday, April 11, ... more